G-Tab G Tab W611 Smart Band With Large Battery Life, Heart Rate/ Sleep Monitor, Call Alert Or Sms Notification, Step Count, Multiple Sport Mode For Men, Women & Kids, Gray, SmallBrand: Visit the G Tab Store Color: Gray Features: Professional exercise pattern monitorin: scientific running training system for you to customize you to run monitoring. Supports all around movement data tracking and training data Sleep monitoring: detecting sleep quality, records sleep data and plans for a healthy sleeping habit Large battery: this has long lasting battery life and usb charging design. 15 days standby, 4 6 days working time